feat(flow): retry failed orders

Add ability to re-import individual ERROR/SKIPPED orders directly from
the order detail modal. Downloads narrow date range from GoMag API,
finds the specific order, and re-runs import_single_order().

Backend:
- New retry_service.py with retry_single_order() — downloads order_date
  ±1 day from GoMag, finds order by number, imports via import_service
- Guard: blocks retry during active sync (_sync_lock check)
- POST /api/orders/{order_number}/retry endpoint

Frontend:
- "Reimporta" button in modal footer (visible only for ERROR/SKIPPED)
- Spinner during retry, success/error feedback with auto-refresh

Cache-bust: shared.js?v=18

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/app/services/retry_service.py

@@ -0,0 +1,131 @@
+"""Retry service — re-import individual failed/skipped orders."""
+import asyncio
+import logging
+import tempfile
+from datetime import datetime, timedelta
+
+logger = logging.getLogger(__name__)
+
+
+async def retry_single_order(order_number: str, app_settings: dict) -> dict:
+    """Re-download and re-import a single order from GoMag.
+
+    Steps:
+    1. Read order from SQLite to get order_date / customer_name
+    2. Check sync lock (no retry during active sync)
+    3. Download narrow date range from GoMag (order_date ± 1 day)
+    4. Find the specific order in downloaded data
+    5. Run import_single_order()
+    6. Update status in SQLite
+
+    Returns: {"success": bool, "message": str, "status": str|None}
+    """
+    from . import sqlite_service, sync_service, gomag_client, import_service, order_reader
+
+    # Check sync lock
+    if sync_service._sync_lock.locked():
+        return {"success": False, "message": "Sync in curs — asteapta finalizarea"}
+
+    # Get order from SQLite
+    detail = await sqlite_service.get_order_detail(order_number)
+    if not detail:
+        return {"success": False, "message": "Comanda nu a fost gasita"}
+
+    order_data = detail["order"]
+    status = order_data.get("status", "")
+    if status not in ("ERROR", "SKIPPED"):
+        return {"success": False, "message": f"Retry permis doar pentru ERROR/SKIPPED (status actual: {status})"}
+
+    order_date_str = order_data.get("order_date", "")
+    customer_name = order_data.get("customer_name", "")
+
+    # Parse order date for narrow download window
+    try:
+        order_date = datetime.fromisoformat(order_date_str.replace("Z", "+00:00")).date()
+    except (ValueError, AttributeError):
+        order_date = datetime.now().date() - timedelta(days=1)
+
+    gomag_key = app_settings.get("gomag_api_key") or None
+    gomag_shop = app_settings.get("gomag_api_shop") or None
+
+    with tempfile.TemporaryDirectory() as tmp_dir:
+        try:
+            today = datetime.now().date()
+            days_back = (today - order_date).days + 1
+            if days_back < 2:
+                days_back = 2
+
+            await gomag_client.download_orders(
+                tmp_dir, days_back=days_back,
+                api_key=gomag_key, api_shop=gomag_shop,
+                limit=200,
+            )
+        except Exception as e:
+            logger.error(f"Retry download failed for {order_number}: {e}")
+            return {"success": False, "message": f"Eroare download GoMag: {e}"}
+
+        # Find the specific order in downloaded data
+        target_order = None
+        orders, _ = order_reader.read_json_orders(json_dir=tmp_dir)
+        for o in orders:
+            if str(o.number) == str(order_number):
+                target_order = o
+                break
+
+        if not target_order:
+            return {"success": False, "message": f"Comanda {order_number} nu a fost gasita in GoMag API"}
+
+    # Import the order
+    id_pol = int(app_settings.get("id_pol") or 0)
+    id_sectie = int(app_settings.get("id_sectie") or 0)
+    id_gestiune = app_settings.get("id_gestiune", "")
+    id_gestiuni = [int(g.strip()) for g in id_gestiune.split(",") if g.strip()] if id_gestiune else None
+
+    try:
+        result = await asyncio.to_thread(
+            import_service.import_single_order,
+            target_order, id_pol=id_pol, id_sectie=id_sectie,
+            app_settings=app_settings, id_gestiuni=id_gestiuni
+        )
+    except Exception as e:
+        logger.error(f"Retry import failed for {order_number}: {e}")
+        await sqlite_service.upsert_order(
+            sync_run_id="retry",
+            order_number=order_number,
+            order_date=order_date_str,
+            customer_name=customer_name,
+            status="ERROR",
+            error_message=f"Retry failed: {e}",
+        )
+        return {"success": False, "message": f"Eroare import: {e}"}
+
+    if result.get("success"):
+        await sqlite_service.upsert_order(
+            sync_run_id="retry",
+            order_number=order_number,
+            order_date=order_date_str,
+            customer_name=customer_name,
+            status="IMPORTED",
+            id_comanda=result.get("id_comanda"),
+            id_partener=result.get("id_partener"),
+            error_message=None,
+        )
+        if result.get("id_adresa_facturare") or result.get("id_adresa_livrare"):
+            await sqlite_service.update_import_order_addresses(
+                order_number=order_number,
+                id_adresa_facturare=result.get("id_adresa_facturare"),
+                id_adresa_livrare=result.get("id_adresa_livrare"),
+            )
+        logger.info(f"Retry successful for order {order_number} → IMPORTED")
+        return {"success": True, "message": "Comanda reimportata cu succes", "status": "IMPORTED"}
+    else:
+        error = result.get("error", "Unknown error")
+        await sqlite_service.upsert_order(
+            sync_run_id="retry",
+            order_number=order_number,
+            order_date=order_date_str,
+            customer_name=customer_name,
+            status="ERROR",
+            error_message=f"Retry: {error}",
+        )
+        return {"success": False, "message": f"Import esuat: {error}", "status": "ERROR"}